The organization of flash electroretinography unit in Veterinary Medicine

Honsho, Cristiane dos Santos; Oriá, Arianne Pontes; Júnior, Luiz Paulo da Veiga Monteiro Lazaro; Neto, Francisco Dorea; Laus, José Luiz

doi:10.1590/s0103-84782004000400021

Cited by 3 publications

(2 citation statements)

References 12 publications

(30 reference statements)

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“…Luz de intensidade, comprimentos de onda e duração de fl ashes variáveis são direcionados à superfície da córnea (HONSHO et al, 2004). O exame registra onda elétrica que corresponde à diferença de potencial capturado pelos eletrodos ativo monopolar (que pode ser em forma de lente de contato colocado sobre a córnea no caso do erg-jet, ou de microfi bra…”

Section: Exames Complementaresunclassified

Atrofia progressiva generalizada da retina em cães da raça Cocker Spaniel

et al. 2013

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Section: Exames Complementaresunclassified

Atrofia progressiva generalizada da retina em cães da raça Cocker Spaniel

et al. 2013

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“…The morphological and molecular features of the photoreceptor cells from mammals represent a complex pattern of evolutionary genetic events, leading to a number of different light-sensitive systems (Mcllwain, 1996;Nilsson, 2009). The functionality of these systems can be evaluated by different electroretinography (ERG) techniques (Narfstrom et al, 2002a), such as flash ERG, which allows the evaluation of the external layers of the retina, through a light stimulus with controlled intensity, frequency, and color (Honsho et al, 2004). The main components of flash ERG are the a-wave (negative deflection) that originates in the outer layers, as a result of the activity of cones and rods, and the b-wave (positive deflection) that originates from the depolarization of Müller and bipolar cells (Oriá et al, 2004).…”

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confidence: 99%

Electroretinography in eight species of neotropical deer

Crivelaro

Thiesen

Aldrovani

et al. 2018

Arq. Bras. Med. Vet. Zootec.

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The aim of this study was to establish normal baseline ERG values of 23 anesthetized deer belonging to 8 neotropical species (Mazama americana, Mazama nemorivaga, Mazama gouazoubira, Mazama nana, Mazama bororo, Ozotocerus bezoarticus, Odocoileus virginianus and Blastocerus dichotomus). Only right eyes were studied. Chemical restraint was performed using xylazine associated with ketamine, IM, for M. americana, M. gouazoubira, M. nemorivaga, M. nana, M. bororo, O. bezoarticus and O. virginianus. A combination of tiletamine/zolazepam diluted in xylazine 2% was used for B. dichotomus individuals. After 20min of dark adaptation, electroretinograms were obtained using a handheld electroretinography (ERG) machine using the QuickRetCheck Protocol at three different light intensities: 0.01cd.s/m2, 3cd.s/m2, and 10cd.s/m2. After light adaptation, photopic phase was recorded. A-wave amplitude recorded during pattern mixed rod/cone response in M. americana was significantly lower when compared to B. dichotomus. No other differences were observed between the species studied. ERG in Neotropical deer is applicable using a portable ERG system and did not show differences among species in relation to the retinal response at different light intensities. Therefore, the lifestyle of the species is more dictated by the selection pressure of the environment than by physiological factors.

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Normal clinical electroretinography parameters for poodle, Labrador retriever, Thai ridgeback, and Thai Bangkaew

et al. 2015

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The purpose of the present study was to establish normal electroretinogram (ERG) parameters using 56 normal eyes of four dog breeds common in Thailand: poodle, Labrador retriever, Thai ridgeback, and Thai Bangkaew. Standard ERG findings were bilaterally recorded using a handheld multi-species ERG unit with an ERG-jet lens electrode for 28 dogs under preanesthesia with diazepam, anesthesia with propofol, and anesthesia maintenance with isoflurane. There were significant differences in the mean values of ERG amplitudes and implicit times among the four dog breeds (p < 0.05) except for the b-wave implicit time of the photopic 30 Hz flicker response with 3 cd.s/m2 (p = 0.610). Out of the four breeds, Thai Bangkaew had the longest implicit time (p < 0.001) of scotopic low intensity responses, b-wave of scotopic standard intensity responses (3 cd.s/m2), a-wave of the higher intensity response (10 cd.s/m2), and a-wave of the photopic single flash response (3 cd.s/m2). For the b/a ratio, only the ratio of the Cone response was significantly different among the different breeds. In this summary, normal ERG parameters for four dog breeds were reported. Data from the investigation supported the hypothesis that determination of breed-specific limits of normality for ERG responses is necessary for individual clinics and laboratories.

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The organization of flash electroretinography unit in Veterinary Medicine

Cited by 3 publications

References 12 publications

Atrofia progressiva generalizada da retina em cães da raça Cocker Spaniel

Atrofia progressiva generalizada da retina em cães da raça Cocker Spaniel

Electroretinography in eight species of neotropical deer

Normal clinical electroretinography parameters for poodle, Labrador retriever, Thai ridgeback, and Thai Bangkaew

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